Trouble getting trouble codes
 

I've been having trouble staring my '98 TJ 4cyl in the morning, and
I'd like to pull the trouble codes from the engine- I've tried the
on-off-on-off-on trick with the ignition- but neither the check engine
light or the odometer flashed any codes at all. Not even 55. I've
looked all thru the newsgroup for an answer, but with no luck. I
*did* see a post that said that some jeeps don't show codes, but have
to be hooked up to an OBD scan tool to get the codes- any truth to
this?

As far as the problem itself, the first start of the day the starter
turns just fine and after an extra 4-5 seconds of cranking the engine
sometimes struggles to life. Sometimes it takes just an extra second
or two. After the engine does start, it runs "weak" for about 2
minutes, too much gas or load on the engine will stall it out. After
that, it's fine the balance of the day. I'll park it at work and fire
it up 4 hours later, and it starts and runs just fine then and at the
end of the day (another 5 hours later). I've been going out at 10pm
and running it for a minute or two, and that seems to make it easier
to start in the mornings. Seems like the longer it sits the worse it
gets- I let it sit for a day and a half once and at noon, it just
wouldn't start at all.

After cranking it many times, I walked away in disgust, and then an
hour later, wouldntcha know, it started right up.



Any ideas?

Many thanks-

Jason Iceman

Re: Trouble getting trouble codes
 

Sadly true. My 6-98 built one doesn't do the codes.

Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ
"Jason Iceman" <jasoniceman@gmail.com> wrote in message
news:d033c91b.0409160804.3e381bea@posting.google.c om...
I
> *did* see a post that said that some jeeps don't show codes, but have
> to be hooked up to an OBD scan tool to get the codes- any truth to
> this?

Re: Trouble getting trouble codes
 

Sadly true. My 6-98 built one doesn't do the codes.

Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ
"Jason Iceman" <jasoniceman@gmail.com> wrote in message
news:d033c91b.0409160804.3e381bea@posting.google.c om...
I
> *did* see a post that said that some jeeps don't show codes, but have
> to be hooked up to an OBD scan tool to get the codes- any truth to
> this?

Re: Trouble getting trouble codes
 

Sadly true. My 6-98 built one doesn't do the codes.

Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ
"Jason Iceman" <jasoniceman@gmail.com> wrote in message
news:d033c91b.0409160804.3e381bea@posting.google.c om...
I
> *did* see a post that said that some jeeps don't show codes, but have
> to be hooked up to an OBD scan tool to get the codes- any truth to
> this?

Re: Trouble getting trouble codes
 

As far as I know the on-off-on-off-on trick only works on pre-'96
vehicles. Vehicles built during or after the '96 model year have OBD II
systems and you need a scanner to get the codes. At least that's my
understanding.

Jay

Jason Iceman wrote:

> I've been having trouble staring my '98 TJ 4cyl in the morning, and
> I'd like to pull the trouble codes from the engine- I've tried the
> on-off-on-off-on trick with the ignition- but neither the check engine
> light or the odometer flashed any codes at all. Not even 55. I've
> looked all thru the newsgroup for an answer, but with no luck. I
> *did* see a post that said that some jeeps don't show codes, but have
> to be hooked up to an OBD scan tool to get the codes- any truth to
> this?
>
> As far as the problem itself, the first start of the day the starter
> turns just fine and after an extra 4-5 seconds of cranking the engine
> sometimes struggles to life. Sometimes it takes just an extra second
> or two. After the engine does start, it runs "weak" for about 2
> minutes, too much gas or load on the engine will stall it out. After
> that, it's fine the balance of the day. I'll park it at work and fire
> it up 4 hours later, and it starts and runs just fine then and at the
> end of the day (another 5 hours later). I've been going out at 10pm
> and running it for a minute or two, and that seems to make it easier
> to start in the mornings. Seems like the longer it sits the worse it
> gets- I let it sit for a day and a half once and at noon, it just
> wouldn't start at all.
>
> After cranking it many times, I walked away in disgust, and then an
> hour later, wouldntcha know, it started right up.
>
>
>
> Any ideas?
>
> Many thanks-
>
> Jason Iceman

Re: Trouble getting trouble codes
 

As far as I know the on-off-on-off-on trick only works on pre-'96
vehicles. Vehicles built during or after the '96 model year have OBD II
systems and you need a scanner to get the codes. At least that's my
understanding.

Jay

Jason Iceman wrote:

> I've been having trouble staring my '98 TJ 4cyl in the morning, and
> I'd like to pull the trouble codes from the engine- I've tried the
> on-off-on-off-on trick with the ignition- but neither the check engine
> light or the odometer flashed any codes at all. Not even 55. I've
> looked all thru the newsgroup for an answer, but with no luck. I
> *did* see a post that said that some jeeps don't show codes, but have
> to be hooked up to an OBD scan tool to get the codes- any truth to
> this?
>
> As far as the problem itself, the first start of the day the starter
> turns just fine and after an extra 4-5 seconds of cranking the engine
> sometimes struggles to life. Sometimes it takes just an extra second
> or two. After the engine does start, it runs "weak" for about 2
> minutes, too much gas or load on the engine will stall it out. After
> that, it's fine the balance of the day. I'll park it at work and fire
> it up 4 hours later, and it starts and runs just fine then and at the
> end of the day (another 5 hours later). I've been going out at 10pm
> and running it for a minute or two, and that seems to make it easier
> to start in the mornings. Seems like the longer it sits the worse it
> gets- I let it sit for a day and a half once and at noon, it just
> wouldn't start at all.
>
> After cranking it many times, I walked away in disgust, and then an
> hour later, wouldntcha know, it started right up.
>
>
>
> Any ideas?
>
> Many thanks-
>
> Jason Iceman

Re: Trouble getting trouble codes
 

As far as I know the on-off-on-off-on trick only works on pre-'96
vehicles. Vehicles built during or after the '96 model year have OBD II
systems and you need a scanner to get the codes. At least that's my
understanding.

Jay

Jason Iceman wrote:

> I've been having trouble staring my '98 TJ 4cyl in the morning, and
> I'd like to pull the trouble codes from the engine- I've tried the
> on-off-on-off-on trick with the ignition- but neither the check engine
> light or the odometer flashed any codes at all. Not even 55. I've
> looked all thru the newsgroup for an answer, but with no luck. I
> *did* see a post that said that some jeeps don't show codes, but have
> to be hooked up to an OBD scan tool to get the codes- any truth to
> this?
>
> As far as the problem itself, the first start of the day the starter
> turns just fine and after an extra 4-5 seconds of cranking the engine
> sometimes struggles to life. Sometimes it takes just an extra second
> or two. After the engine does start, it runs "weak" for about 2
> minutes, too much gas or load on the engine will stall it out. After
> that, it's fine the balance of the day. I'll park it at work and fire
> it up 4 hours later, and it starts and runs just fine then and at the
> end of the day (another 5 hours later). I've been going out at 10pm
> and running it for a minute or two, and that seems to make it easier
> to start in the mornings. Seems like the longer it sits the worse it
> gets- I let it sit for a day and a half once and at noon, it just
> wouldn't start at all.
>
> After cranking it many times, I walked away in disgust, and then an
> hour later, wouldntcha know, it started right up.
>
>
>
> Any ideas?
>
> Many thanks-
>
> Jason Iceman

Re: Trouble getting trouble codes
 

Sounds like a fuel pump/pressure issue. IIRC, there is a valve in the fuel
pump that is supposed to prevent the pressure and fuel from running back to
the fuel tank when the engine is turned off. My suggestion is turn the key
to the run position, let it sit for 5 seconds without turning the engine
over, turn the key off, turn it back to run for 5 seconds, turn it off, then
try to start it. My guess is it will start much easier.
"Jason Iceman" <jasoniceman@gmail.com> wrote in message
news:d033c91b.0409160804.3e381bea@posting.google.c om...
> I've been having trouble staring my '98 TJ 4cyl in the morning, and
> I'd like to pull the trouble codes from the engine- I've tried the
> on-off-on-off-on trick with the ignition- but neither the check engine
> light or the odometer flashed any codes at all. Not even 55. I've
> looked all thru the newsgroup for an answer, but with no luck. I
> *did* see a post that said that some jeeps don't show codes, but have
> to be hooked up to an OBD scan tool to get the codes- any truth to
> this?
>
> As far as the problem itself, the first start of the day the starter
> turns just fine and after an extra 4-5 seconds of cranking the engine
> sometimes struggles to life. Sometimes it takes just an extra second
> or two. After the engine does start, it runs "weak" for about 2
> minutes, too much gas or load on the engine will stall it out. After
> that, it's fine the balance of the day. I'll park it at work and fire
> it up 4 hours later, and it starts and runs just fine then and at the
> end of the day (another 5 hours later). I've been going out at 10pm
> and running it for a minute or two, and that seems to make it easier
> to start in the mornings. Seems like the longer it sits the worse it
> gets- I let it sit for a day and a half once and at noon, it just
> wouldn't start at all.
>
> After cranking it many times, I walked away in disgust, and then an
> hour later, wouldntcha know, it started right up.
>
>
>
> Any ideas?
>
> Many thanks-
>
> Jason Iceman

Re: Trouble getting trouble codes
 

Sounds like a fuel pump/pressure issue. IIRC, there is a valve in the fuel
pump that is supposed to prevent the pressure and fuel from running back to
the fuel tank when the engine is turned off. My suggestion is turn the key
to the run position, let it sit for 5 seconds without turning the engine
over, turn the key off, turn it back to run for 5 seconds, turn it off, then
try to start it. My guess is it will start much easier.
"Jason Iceman" <jasoniceman@gmail.com> wrote in message
news:d033c91b.0409160804.3e381bea@posting.google.c om...
> I've been having trouble staring my '98 TJ 4cyl in the morning, and
> I'd like to pull the trouble codes from the engine- I've tried the
> on-off-on-off-on trick with the ignition- but neither the check engine
> light or the odometer flashed any codes at all. Not even 55. I've
> looked all thru the newsgroup for an answer, but with no luck. I
> *did* see a post that said that some jeeps don't show codes, but have
> to be hooked up to an OBD scan tool to get the codes- any truth to
> this?
>
> As far as the problem itself, the first start of the day the starter
> turns just fine and after an extra 4-5 seconds of cranking the engine
> sometimes struggles to life. Sometimes it takes just an extra second
> or two. After the engine does start, it runs "weak" for about 2
> minutes, too much gas or load on the engine will stall it out. After
> that, it's fine the balance of the day. I'll park it at work and fire
> it up 4 hours later, and it starts and runs just fine then and at the
> end of the day (another 5 hours later). I've been going out at 10pm
> and running it for a minute or two, and that seems to make it easier
> to start in the mornings. Seems like the longer it sits the worse it
> gets- I let it sit for a day and a half once and at noon, it just
> wouldn't start at all.
>
> After cranking it many times, I walked away in disgust, and then an
> hour later, wouldntcha know, it started right up.
>
>
>
> Any ideas?
>
> Many thanks-
>
> Jason Iceman

Re: Trouble getting trouble codes
 

Sounds like a fuel pump/pressure issue. IIRC, there is a valve in the fuel
pump that is supposed to prevent the pressure and fuel from running back to
the fuel tank when the engine is turned off. My suggestion is turn the key
to the run position, let it sit for 5 seconds without turning the engine
over, turn the key off, turn it back to run for 5 seconds, turn it off, then
try to start it. My guess is it will start much easier.
"Jason Iceman" <jasoniceman@gmail.com> wrote in message
news:d033c91b.0409160804.3e381bea@posting.google.c om...
> I've been having trouble staring my '98 TJ 4cyl in the morning, and
> I'd like to pull the trouble codes from the engine- I've tried the
> on-off-on-off-on trick with the ignition- but neither the check engine
> light or the odometer flashed any codes at all. Not even 55. I've
> looked all thru the newsgroup for an answer, but with no luck. I
> *did* see a post that said that some jeeps don't show codes, but have
> to be hooked up to an OBD scan tool to get the codes- any truth to
> this?
>
> As far as the problem itself, the first start of the day the starter
> turns just fine and after an extra 4-5 seconds of cranking the engine
> sometimes struggles to life. Sometimes it takes just an extra second
> or two. After the engine does start, it runs "weak" for about 2
> minutes, too much gas or load on the engine will stall it out. After
> that, it's fine the balance of the day. I'll park it at work and fire
> it up 4 hours later, and it starts and runs just fine then and at the
> end of the day (another 5 hours later). I've been going out at 10pm
> and running it for a minute or two, and that seems to make it easier
> to start in the mornings. Seems like the longer it sits the worse it
> gets- I let it sit for a day and a half once and at noon, it just
> wouldn't start at all.
>
> After cranking it many times, I walked away in disgust, and then an
> hour later, wouldntcha know, it started right up.
>
>
>
> Any ideas?
>
> Many thanks-
>
> Jason Iceman